Bicycle frame



FIG. 1 is a perspective view of a bicycle frame showing our new design, the bicycle portions shown in broken lines are for illustrative purposes only and form no part of the claimed design;

FIG. 2 is a right-side elevational view of the bicycle frame of FIG. 1;

FIG. 3 is a left-side elevational view of the bicycle frame of FIG. 1;

FIG. 4 is a front elevational view of the bicycle frame of FIG. 1;

FIG. 5 is a rear elevational view of the bicycle frame of FIG. 1;

FIG. 6 is a top view of the bicycle frame of FIG. 1; and,

FIG. 7 is a bottom view of the bicycle frame of FIG. 1. 

The ornamental design for a bicycle frame, as shown and described. 